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Plant Cell
The basic unit of a plant cell.
Robert Hooke
Observed cells in cork in 1665.
Anton van Leeuwenhoek
Discovered protozoa, bacteria, and cells in plant cells.
Robert Brown
Discovered the free cell and named the nucleus in 1831.
Schleiden & Schwann
Recognized cells as the basic units of life and proposed the cell theory in 1838.
Rudolph Virchow
Concluded 'Omnis cellula e cellula' (cells come from preexisting cells) in 1858.
Prokaryotic Cell
A cell that lacks a nucleus and membrane-bound organelles; contains circular DNA located in the nucleoid region.
Eukaryotic Cell
Has a nucleus and membrane-bound organelles.